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  1. Horsetail 
    https://medlineplus.gov/druginfo/natural/843.html
    ... also decrease potassium levels. Taking horsetail along with "water pills" might make potassium levels drop too low.ModerateBe cautious with this combination.Talk with your health provider.
  2. Excluded Studies - Noninvasive Treatments for Low Back Pain - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK350267
    ... Comparison of the effects of land-based and water-based therapeutic exercises on the range of ... of willow bark for musculoskeletal pain. Phytother Res. 2009; 23 ( ...